# Master Thai Numbers! vs Book by Book

The clearest difference is ads: Book by Book at none against Master Thai Numbers!'s shown. Book by Book also leads on update cadence (every 2 months vs every 11 months). Master Thai Numbers!'s advantage is device support (3 vs 1) and iOS requirement (17.0 vs 26). On price and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Master Thai Numbers! ships an update every 11 months, Book by Book every 2 months. The most recent releases landed on June 23, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Master Thai Numbers! | Book by Book |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 11 months | **Every 2 months** |
| Size | 9 MB | 7 MB |
| Requires iOS | **17.0** | 26 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [hiromu izuwa](https://appshunter.io/developer/599721911) | [Spiderweb Security LLC](https://appshunter.io/developer/1885575905) |

## What reviewers say

### Master Thai Numbers!

[App page](https://appshunter.io/ios/app/master-thai-numbers/id978218233)

**Features:** macOS Compatibility

**In-app purchases:** none


### Book by Book

[App page](https://appshunter.io/ios/app/book-by-book/id6790630928)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Master Thai Numbers! free?

Master Thai Numbers! is free to download, with no in-app purchases.

### Is Book by Book free?

Book by Book is free to download, with no in-app purchases.

### Do Master Thai Numbers! or Book by Book have ads?

Master Thai Numbers! shows ads; Book by Book does not.

### Which is updated more often, Master Thai Numbers! or Book by Book?

Master Thai Numbers! ships an update every 11 months, and Book by Book every 2 months. Most recently, Master Thai Numbers! was updated on June 23, 2026 and Book by Book on October 13, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*